Howling at the Sun

King Aerys fell at the hands of Jaime Lannister, but Prince Rhaegar defeated Robert Baratheon and stopped the rebellion. The Targaryens hold the throne, and Rhaegar wants revenge for his father's death. He demands that the Starks and the Lannisters give their only Lady to the two Princes, Viserys Targaryen and Oberyn Martell, uniting Westeros and bringing peace.

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Past AU, so no spoilers. Viserys and Daenerys have been aged up for the purposes of this story.